Finding the Fourth Proportional to 171.82, 236.82 and 139.02

Step by Step Solution

1. Step 1: Write the proportion equation
   171.82 : 236.82 = 139.02 : x
2. Step 2: Convert to fraction form
   171.82/236.82 = 139.02/x
3. Step 3: Cross multiply
   171.82x = 236.82 × 139.02
4. Step 4: Simplify right side
   171.82x = 32,922.72
5. Step 5: Solve for x
   x = 32,922.72/171.82
6. Step 6: Final answer
   x = 191.61